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Title: | Kondo-hole substitution in heavy fermions: Dynamics and transport |
Authors: | Kumar, Pramod Vidhyadhiraja, N. S. |
Keywords: | Condensed Matter Physics Periodic Anderson Model Mean-Field Theory Infinite Dimensions Liquid Behavior Renormalization-Group Intermediate Valence Quantum Criticality Electron-Systems Metals Temperature |
Issue Date: | 2014 |
Publisher: | American Physical Society |
Citation: | Kumar, P; Vidhyadhiraja, NS, Kondo-hole substitution in heavy fermions: Dynamics and transport. Physical Review B 2014, 90 (23), 235133 http://dx.doi.org/10.1103/PhysRevB.90.235133 Physical Review B 90 23 |
Abstract: | Kondo-hole substitution is a unique probe for exploring the interplay of interactions, f-electron dilution, and disorder in heavy-fermion materials. Within the diluted periodic Anderson model, we investigate the changes in single-particle dynamics as well as response functions, as a function of Kondo-hole concentration (x) and temperature. We show that the spectral weight transfers due to Kondo-hole substitution have characteristics that are different from those induced by temperature; the dc resistivity crosses over from a highly nonmonotonic form with a coherence peak in the x -> 0 limit to a monotonic single-impurity-like form that saturates at low temperature. The thermopower exhibits a characteristic maximum as a function of temperature, the value of which changes sign with increasing x, and its location is shown to correspond to a low energy scale of the system. The Hall coefficient also changes sign with increasing x at zero temperature and is highly temperature dependent for all x. As x is increased beyond a certain x(c), the Drude peak and the mid-infrared peak in the optical conductivity vanish almost completely; a peak in the optical scattering rate melts and disappears eventually. We discuss the above-mentioned changes in the properties in terms of a crossover from coherent, Kondo lattice behavior to single-impurity-like, incoherent behavior with increasing x. A comparison of theory with experiments carried out for the dc resistivity and the thermopower of Ce1-xLaxB6 yields good agreement. |
Description: | Restricted Access |
URI: | https://libjncir.jncasr.ac.in/xmlui/10572/2580 |
ISSN: | 1098-0121 |
Appears in Collections: | Research Articles (Vidhyadhiraja N. S.) |
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